Abstract
The authors investigated into the fundamental characteristics of the external forces on foundation piles from flowing liquefied soil by experiments under a centrifuge condition. The followings were obtained as conclusions; the viscous force resulting from the ground flow velocity of liquefied soil was dominant when model ground was completely liquefied. On the contrary, the external force resulting from ground displacements was governing the pile deformation when the model ground was not liquefied, or partially liquefied. Furthermore, when the liquefied soil was overlaid with a non-liquefied soil, external forces resulting from ground displacements of the non-liquefied soil was dominant.
